feat: add admin panel with multi-chain support and notification system

- Add full admin REST API: auth, API keys, chains, chain tokens, wallets,
  orders, RPC nodes, settings, dashboard stats, notifications
- Add JWT-based admin authentication and API key auth middleware
- Add multi-chain listeners: BSC, ETH, Polygon, Plasma, EVM WebSocket
- Add RPC node health check job with automatic failover
- Add Telegram notification channel for order events
- Add installer for first-run database initialization
- Add new DB models: admin_user, api_key, chain, chain_token,
  rpc_node, settings, notification_channel
- Add order statistics aggregation (daily/monthly/by-chain)
- Serve built admin SPA from embedded www/ assets
- Add comprehensive test coverage for all new features

src/main.go

@@ -1,11 +1,110 @@
 package main
 
 import (
+	"embed"
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+
 	"github.com/assimon/luuu/command"
 	"github.com/gookit/color"
 )
 
+//go:embed all:static
+var staticDir embed.FS
+
+//go:embed all:www
+var wwwDir embed.FS
+
+func executableDir() (string, error) {
+	exePath, err := os.Executable()
+	if err != nil {
+		return "", err
+	}
+	exePath, err = filepath.EvalSymlinks(exePath)
+	if err != nil {
+		return "", err
+	}
+	return filepath.Dir(exePath), nil
+}
+
+func extractEmbeddedDir(src embed.FS, embeddedRoot, dstRoot string) error {
+	sub, err := fs.Sub(src, embeddedRoot)
+	if err != nil {
+		return err
+	}
+
+	return fs.WalkDir(sub, ".", func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		dstPath := filepath.Join(dstRoot, path)
+
+		if d.IsDir() {
+			return os.MkdirAll(dstPath, 0o755)
+		}
+
+		if err := os.MkdirAll(filepath.Dir(dstPath), 0o755); err != nil {
+			return err
+		}
+
+		in, err := sub.Open(path)
+		if err != nil {
+			return err
+		}
+		defer in.Close()
+
+		out, err := os.OpenFile(dstPath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0o644)
+		if err != nil {
+			return err
+		}
+		defer out.Close()
+
+		_, err = io.Copy(out, in)
+		return err
+	})
+}
+
+func releaseStatic(fs embed.FS, target string) (string, error) {
+	baseDir, err := executableDir()
+	if err != nil {
+		return "", err
+	}
+
+	targetDir := filepath.Join(baseDir, target)
+
+	if err := os.RemoveAll(targetDir); err != nil {
+		return "", err
+	}
+
+	if err := os.MkdirAll(targetDir, 0o755); err != nil {
+		return "", err
+	}
+
+	if err := extractEmbeddedDir(fs, target, targetDir); err != nil {
+		return "", err
+	}
+
+	return targetDir, nil
+}
+
 func main() {
+	staticPath, err := releaseStatic(staticDir, "static")
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("static released to:", staticPath)
+
+	wwwwPath, err := releaseStatic(wwwDir, "www")
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println("www released to:", wwwwPath)
+
 	defer func() {
 		if err := recover(); err != nil {
 			color.Error.Println("[Start Server Err!!!] ", err)